National Geographic has long been at the forefront when it comes to mapping the ocean so this latest effort is immediately of interest. It exceeds expectations especially considering the reasonable cost of the volume. Brief check of a few areas, e.g. the Ross Sea in the Antarctic and Saya de Malha Bank in the Indian Ocean where I am working with the Whale and Dolphin Conservation Society on marine protected area proposals, to see how they are treated. Answer: with great accuracy.
With photographic glimpses of undersea flora and fauna and extensive background to complement the maps, this is an essential reference for everyone who cares about the sea. The Deep Ocean, the mare incognita, less well known and less visited than the Moon, will be the story of this century. I can imagine a child devouring this book and becoming captivated, growing up to make the discoveries that will render this book obsolete...but for now it is state of the art.